Normal weight for 8 month olds

The average weight for 8 month old baby boys is 20 lbs and 8 month old baby girls average 18.3 lbs1 The tables below show the distribution of weight by percentile of the 8 month year old population.

Current units = pounds. View this page in kilograms.

8 month old girls under 15 lbs or over 21 lbs and 8 month old boys who weigh less than 17 lbs or more than 23 lbs may want to consult a doctor. The American Academy of Pediatrics recommends that children who's weight is outside the 5th or 85th percentiles seek professional advice to determine if further evaluation is needed2.

Body weight percentile chart for 8 month old baby boys
Percentile Weight
3rd 16.2 lbs
5th 16.7 lbs
10th 17.3 lbs
25th 18.6 lbs
50th 20 lbs
75th 21.6 lbs
90th 23.2 lbs
95th 24.2 lbs
97th 24.8 lbs
Body weight percentile chart for 8 month old baby girls
Percentile Weight
3rd 14.8 lbs
5th 15.2 lbs
10th 15.9 lbs
25th 17 lbs
50th 18.3 lbs
75th 19.7 lbs
90th 21.1 lbs
95th 22 lbs
97th 22.5 lbs

Source Citations
  1. Robert J. Kuczmarski Dr.P.H. et al., Centers for Disease Control and Prevention, U.S. Department of Health & Human Services 2000 CDC Growth Charts for the United States: Methods and Development
  2. American Academy of Pediatrics Is Your Child Overweight?

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